Mary had some troubles, so she went to see the doctor. He was a new doctor, and did not know her. So he first asked her some questions. One of the questions was, “What is your age?”
“Well...” Mary answered, “I don't quite remember, doctor, but I will try to think.” She thought for a while and then said, “Yes, I remember now, doctor. When I married, I was twenty-two years old, and my husband was thirty then. Now he is sixty, I know, and that is twice thirty. And so I am twice twenty-two. That is forty-four, isn't it?”
小题1:Mary went to see the doctor because ________ .
A．she had a headache
B．she had a fever
C．she had caught a cold
D．she wasn’t feeling well小题2:At first the doctor _________ .
A．asked her some questions
B．examined her carefully
C．gave her some medicine
D．asked her to have a rest小题3:The doctor's first question was “ _______ “.
A．You are no more than forty, are you?
B．Do you have a fever?
C．What is your age?
D．Have you had any medicine?小题4:Mary ________ .
A．answered the doctor's questioned at once
B．answered the question after thinking for a while
C．just kept silent
D．refused to tell her age小题5:Mary should be _______ .
A．forty-four
B．forty-five
C．fifty
D．fifty-two
，s1、s2、O三点共线，它们的连线垂直M、N，且s2O=R..以O为圆心、R为半径的圆形区域内同时存在磁感应强度为B、方向垂直纸面向外的匀强磁场和电场强度为E的匀强电场.D为收集板，板上各点到O点的距离以及板两端点的距离都为2R，板两端点的连线垂直M、N板。质量为m、电荷量为+q的粒子，经s1进入M、N间的电场后，通过s2进入电磁场区域，然后沿直线打到光屏P上的s3点.粒子在s1处的速度和粒子所受的重力均不计.求：
